Depending on the processed material from each drill must be properly sharpened. To verify the correct angle will help a specially prepared square plate of copper or aluminium with a thickness of 1 mm.
To become operational protractor enough to cut it cut, as shown in the picture: a large cutout at an angle of 120 degrees, the other half is 60 degrees and the surviving corner of a square is 90.
Recommend to read
Home foundry
I have subscribed to the “Modelist-Konstruktor” magazine since 1985 and have never regretted it. I read everything: from the first page to the last. It is a very useful and interesting...
FLOATING WITH A CAR
It's good to live on the bank of a wide, full-flowing river! True, this convenient transport artery often becomes an annoying obstacle to communication between settlements. A motorist...
